Building Materials of Mission San Gabriel Arcángel: Adobe, Stone, Lime & Wood

Mission San Gabriel (founded 1771) used locally sourced, traditional materials:

• Adobe – Sun-dried clay/sand/straw bricks (12″×4″×24″), 2–4 ft thick walls; excellent insulation.
• Stone – Quarried & river rock for foundations, portal, window trim, staircases; carved sandstone lintel at church entry; later buttresses.
• Lime mortar – Lime/sand/water binder for adobe/stone; structural stability.
• Wood – Pine/redwood for roof trusses, doors, window frames, choir loft, altar screen; termite-prone, needed maintenance.
• Roofing – Initially tule reeds; later replaced with fired clay tiles (more durable).

These materials reflect both indigenous building knowledge and Spanish colonial adaptation—creating structures that have endured earthquakes, weather, and time.